1 use crate::{ 2 FromDeriveInput, FromField, FromGenericParam, FromGenerics, FromMeta, FromTypeParam, 3 FromVariant, Result, 4 }; 5 6 /// A container to parse some syntax and retain access to the original. 7 #[derive(Debug, Clone, PartialEq, Eq)] 8 pub struct WithOriginal<T, O> { 9 pub parsed: T, 10 pub original: O, 11 } 12 13 impl<T, O> WithOriginal<T, O> { new(parsed: T, original: O) -> Self14 pub fn new(parsed: T, original: O) -> Self { 15 WithOriginal { parsed, original } 16 } 17 } 18 19 macro_rules! with_original { 20 ($trayt:ident, $func:ident, $syn:path) => { 21 impl<T: $trayt> $trayt for WithOriginal<T, $syn> { 22 fn $func(value: &$syn) -> Result<Self> { 23 Ok(WithOriginal::new($trayt::$func(value)?, value.clone())) 24 } 25 } 26 }; 27 } 28 29 with_original!(FromDeriveInput, from_derive_input, syn::DeriveInput); 30 with_original!(FromField, from_field, syn::Field); 31 with_original!(FromGenerics, from_generics, syn::Generics); 32 with_original!(FromGenericParam, from_generic_param, syn::GenericParam); 33 with_original!(FromMeta, from_meta, syn::Meta); 34 with_original!(FromTypeParam, from_type_param, syn::TypeParam); 35 with_original!(FromVariant, from_variant, syn::Variant); 36